Wrong calculation c#

Question

I have some code that divides the number of elements in a collection by one hundred. But in the end it shows the wrong value.

private void FillPages()
        {
            double numofpages = listcoinslist.Count / 100;
            MessageBox.Show(listcoinslist.Count + " " + numofpages);
        }

The picture of the calculation result

I should get 65.6, instead I get 65. The same number is displayed on the label. This is not a display error, but a strange calculus error.

`.Count` is an `int`, `100` is an `int`. `int / int` is an `int`. Assigning an `int` to a `double` does not change that. — crashmstr, Mar 29 '21 at 12:56
Might be a better duplicate, but related: [Why does integer division in C# return an integer and not a float?](https://stackoverflow.com/q/10851273/1441) — crashmstr, Mar 29 '21 at 12:59

score 1 · Accepted Answer · answered Mar 29 '21 at 12:57

1

This is due to rounding to int values because both values seem to be ints. Make sure you have at least one decimal number.

Make sure you devide with a float or double by adding .0, for example:

double numofpages = listcoinslist.Count / 100.0;

answered Mar 29 '21 at 12:57

Waescher

5,361
3
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score 0 · Answer 2 · answered Mar 29 '21 at 12:59

0

double numofpages = (double)listcoinslist.Count / 100;

The problem was that you need to specify the number of elements in the collection as double.

answered Mar 29 '21 at 12:59

Serhii Melnychenko

9
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Wrong calculation c#

2 Answers2